Disclosed is a method for at least partially removing the oscillations occurring at the end of a current discharge through the structural diodes for a switching structure supplying power to an inductive load in the form of an H-bridge and including two controlled high or low power switches forming part of a high circuit or a low circuit, respectively, between a respective output and a power source or a ground, the switching structure having one of its outputs below the ground potential and the other above the potential of the power source during the current discharge through the structural diodes. A detection or anticipation of the end of discharge and a forced preservation of a freewheel after the detection of the end of discharge are carried out, the forced preservation of the freewheel after the detection of the end of discharge taking place for a predetermined preservation time.

A solid state circuit breaker apparatus includes a solid state switch, a current sensor, and a control circuit. The control circuit is programmed to operate the solid state switch by, in response to receipt of a signal from the current sensor indicating that an overcurrent condition exists: (i) using pulse width modulation to generate a set of control pulses; and (ii) using the control pulses to trigger the solid state switch to open and close in a pattern that corresponds to the control pulses, and thus limit an amount of let-through current that the solid state switch may pass to a load. The amount of let-through current that the solid state switch may pass to the load may be, for example, a threshold level above which the overcurrent condition will exist.

An apparatus includes a mechanical switch and a solid-state switch, such as a diamond switch or antiparallel-connected thyristor pair, coupled in series between an AC source and the load, such as a substation input transformer. The control circuit may be configured to connect the AC power source to the load by closing the mechanical switch and turning on the solid-state switch thereafter. The control circuit may be configured to interrupt a connection of the AC source to the load by turning off the solid-state switch and closing the mechanical switch thereafter. Operations of the switches may be coordinated with a fuse coupled in series with the solid-state switch to address different types of fault conditions.

The present disclosure is directed to a rack power distribution unit (RPDU) that automatically and safely switches power to one or more receptacles. The RPDU includes one or more processors utilizing control algorithms that manage bistable relays so that in-rush current is minimized upon manual connection/disconnection of power to a load device. In particular, relay contact status (open/closed) is identified based on changes in RMS or peak voltage influenced by the load impedance. The RPDU is also configured to predict timings for voltage zero-crossing events. In this manner, and based on the determination of relay contact status and voltage zero-crossing prediction, open relay contacts are identified and safely closed at voltage zero-crossing.

A method for determining a transformer state on the basis of correction of dissolved gas data includes receiving, by a transformer state determination apparatus, dissolved gas data, determining, by the transformer state determination apparatus, a measurement error value which is a correction target in the dissolved gas data, correcting, by the transformer state determination apparatus, the measurement error value, and determining, by the transformer state determination apparatus, a transformer state on the basis of the dissolved gas data including the corrected measurement error value.

A power strip and method for providing and controlling power to power strip outlets and for differing amperages and/or voltages is disclosed. The power strip includes a power cord for connecting to a power outlet and a plurality of electrical outlets of the same of differing amperage and voltage connected to receive the electrical current from the power cord. At least one of the plurality of electrical outlets is powered continuously with electrical current from the power outlet. Electrical current from the power outlet to the plurality of electrical outlets is controlled by load presence controlled circuit, current limiting circuit, and/or soft-start circuitry.

A circuit is provided for managing an inrush current of a load. The load is coupled between a voltage source and a terminal for a negative supply potential. The circuit includes a switch that is coupled between the voltage source and the load, and that is configured to connect the load to or disconnect the load from the voltage source. The circuit further includes at least one load capacitor coupled in parallel to the load between the switch and the terminal for negative supply potential. The circuit further includes a control unit. The control unit has a sense unit and a switching unit. The sense unit is configured to determine the inrush current when the switch is closed to connect the load to the voltage source, and the switching unit is configured to control the switching of the switch depending on the inrush current.

Disclosed is a dynamic multi-functional power controller in collocation with a primary side coil, a switching unit, and a current sensing resistor, performing a power control process. An induced current is generated by a secondary side coil coupled with the primary side coil through electromagnetic interaction with a conduction current flowing through the primary side coil, and an output power is generated to supply an external load when the induced current flows through an output rectification unit and an output filter unit. The power control process includes detecting if any abnormal state occurs, stopping a driving signal, waiting for a period of time, and then re-sending the driving signal. Thus, the present invention provides protection for various kinds of peak loading, avoids high power state when an abnormal state is not resolved, and further reduces the average output power, thereby implementing power saving.

A system for providing alternating current to at least one inductive load, the system including at least one switching means for switching power to the load on and off, controller adapted for controlling the at least one switching means and a pre-magnetization device, wherein the pre-magnetization device is configured to generate pulses which cause the switching means to pre-magnetize the inductive load.

A module of suppressing inrush current, a method of controlling the module of suppressing inrush current and an on-board bidirectional charger using the same are provided. The on-board bidirectional charger includes a PFC-inverter module and the module of suppressing inrush current, and the module of suppressing inrush current includes a controlled switch and a suppressor of suppressing inrush current connected in parallel with the controlled switch. The charging and inverting circuits are fully multiplexed, which solves the problem that a high-power on-board charger under harsh AC power supply environment in bidirectional charging cannot provide special protection against inrush current, and can improve power density and circuit efficiency of charging and inversion, realize isolation function including reducing EMI electromagnetic interference and reducing switching interference signals, realize more convenient buck/boost functions, improve using life and performance of devices, reduce cost, and reduce the size of equipment.